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arm64: Take into account ID_AA64PFR0_EL1.CSV3

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For non-KASLR kernels where the KPTI behaviour has not been overridden
on the command line we can use ID_AA64PFR0_EL1.CSV3 to determine whether
or not we should unmap the kernel whilst running at EL0.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon
2017-11-27 18:29:30 +00:00
committed by Catalin Marinas
parent 0617052ddd
commit 179a56f6f9
2 changed files with 8 additions and 1 deletions
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arch/arm64/include/asm/sysreg.h
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@@ -438,6 +438,7 @@
#define ID_AA64ISAR1_DPB_SHIFT 0
/* id_aa64pfr0 */
#define ID_AA64PFR0_CSV3_SHIFT 60
#define ID_AA64PFR0_SVE_SHIFT 32
#define ID_AA64PFR0_GIC_SHIFT 24
#define ID_AA64PFR0_ASIMD_SHIFT 20